核电主设备接管嘴温度场及热应力分析

Thermo-mechanical Analysis of Feedwater Nozzle for Steam Generator

反应堆蒸汽发生器主给水管的热疲劳裂纹问题备受关注,但至今仍未得到完全解决。我们自主开发的结构有限元软件ATLAS根据结构有限元分析的应用特点,运用OpenGL图形引擎的VBO、FBO以及GLSL等技术直接对硬件编程,充分利用GPU的三维渲染能力开发出大模型的高度交互及可视化的仿真环境。ATLAS软件被用来进行反应堆核电主设备接管嘴热应力数值模拟。我们首先建立管嘴的有限元分析简化模型,在ATLAS软件中加载管嘴的内部表面,并对结构加载温度边界进行结构热应力分析得出了热应力变化曲线。我们发现,ATLAS可以准确地导入CAD模型,划分网格,施加各种工况,完成主给水管嘴温度场和热应力分析。ATLAS计算结果与ABAQUS计算结果一致,其准确性得到保证。最后我们对计算结果进行验证并得出结论。

Thermal fatigue crack problems of the feedwater nozzle for steam generator have attracted widely attentions,but haven′t yet been fully resolved.Depending on the application characteristics of finite element analysis,we developed finite element software ATLAS by directly programming to hardware with OpenGL graphics engine VBO,FBO and GLSL technologies.By fully using of three-dimensional rendering capabilities of the GPU,ATLAS provided a large-scale highly interactive visualization environment for engineers.ATLAS was used to simulate the thermal stress of the feedwater nozzle.A simplified model of the nozzle finite element analysis was created,and the loads and temperature boundary conditions of the nozzle were added on the interior surfaces.The thermal stress curve was obtained after conducting structural thermal stress analysis.We found that ATLAS can accurately import CAD models,mesh,apply a variety of conditions,and complete the numerical simulation of the thermal stress of the nozzle.ATLAS results were consistent with those of ABAQUS calculation,so its accuracy was assured.Finally,we validated the results and draw conclusions.